20.500.12556/RUL-102558 Demonstracija lezenja polimernih materialov z uporabo preproste naprave Demonstration of the creep of polymeric materials using simple device Lastnosti polimernih materialov se pri konstantni obremenitvi spreminjajo s časom. Pri konstantni napetosti se deformacija materiala s časom povečuje. Proces povečevanja deformacije s časom pri konstantni napetosti se imenuje lezenje, materialno lastnost materiala, ki iz tega izhaja, pa imenujemo voljnost. V sklopu diplomske naloge smo izdelali preprosto napravo za demonstracijo lezenja različnih polimernih materialov. Naprava omogoča merjenje pri konstantni temperaturi in pri različnih napetostih. V sklopu diplomske naloge smo izmerili pet različnih materialov: 2 gumi z različno trdoto, polivinilklorid (PVC), polietilen nizke gostote (LDPE) in termoplastični poliuretan (TPU). Teste smo izvajali pri časih od 250 do 900 sekund, lastnosti gume z višjo trdoto in polivinilklorida pa smo izmerili tudi v časovnem območju 45000 sekund. Rezultate dobljene s pomočjo preproste naprave, smo primerjali z rezultati, dobljenimi s pomočjo komercialne naprave. Primerjava meritev je pokazala, da se izdelana naprava lahko uporablja za oceno časovno odvisnih lastnosti polimernih materialov, vendar pa meritve na preprosti napravi podcenjujejo voljnost v povprečju za 20,2 %. The properties of polymeric materials at constant load change with time. At constant stress, material deformation increases with time. The process of increasing the deformation with time at constant stress is called creep, while the material property, which results from this behavior, is called creep compliance. Within the thesis, we composed a simple device for demonstrating the creep behavior of various polymer materials. The device allows measurements at constant temperature and various stress levels. Within the thesis, we measured five materials: two rubbers with different hardness, polyvinyl chloride (PVC), low density polyethylene (LDPE) and thermoplastic polyurethane (TPU). The tests were carried out on a time scale from 250 to 900 seconds. The properties of rubber with higher hardness and polyvinyl chloride were measured in the time range of 45000 seconds. The results obtained with simple device were compared with the results obtained on a sophisticated commercial device. The comparison of the measurements has shown that the simple device can be used to estimate the time-dependent properties of polymeric materials; however, the measurements on this device underestimate the creep compliance on average by 20.2 %. lezenje voljnost viskoelastičnost polimeri časovno odvisne lastnosti creep creep compliance viscoelasticity polymers time-dependent properties true false false [T. Skalar] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2018-09-02 07:45:50 2018-09-02 07:45:51 2023-11-14 12:51:24 0000-00-00 00:00:00 2018 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 678.7:539.3(043.2) 207471 16296219 2022.pdf 2022.pdf 1 487FEE08673C532AF90D41EF18F8A297 60921ecc962b0c0f7b487a02c346f2245973ee6b31d0008d3b5019aeadfe7a6c 8d068fbe-a1b5-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=112883 2028.pdf 2028.pdf 1 0C7112B6A179D0BE10F48952A8ECB5F8 90c64ee8e9e1b1a0352f975ddbc61a0a0ac86cd9c327fea9020f561e52c95529 8d72169e-a1b5-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=112889 2027.pdf 2027.pdf 1 9A8BEA27B7BE94EBAF42ED21E2BD744B 1ecb54d7092ebd6bdab58cfcdcfcf2294f3fa14998a697bc323ac45e2cc0db5d 8d5efdec-a1b5-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=112888 2029.pdf 2029.pdf 1 B899945B01DCEBBE5B195AD511AE6518 33f33f4c2ef9eef54c4e686b06ef365c647a05971e4540501ddc60a6fb3f2424 8d852c0f-a1b5-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=112890 2031.pdf 2031.pdf 1 8FACB4C94FEBB6880DF86766766E890F e1e0aae95361b6a1dd9d6107d8532ad8857b2bf138eb6331c6783d4216f79861 8da68909-a1b5-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=112892 Fakulteta za strojništvo 0 0 0